1 files changed, 32 insertions, 0 deletions
diff --git a/src/datavis3d/engine/shaders/fragmentShaderAmbient b/src/datavis3d/engine/shaders/fragmentShaderAmbient
new file mode 100644
index 00000000..88f850f3
--- /dev/null
+++ b/src/datavis3d/engine/shaders/fragmentShaderAmbient
@@ -0,0 +1,32 @@
+#version 120
+
+uniform highp vec3 lightPosition_wrld;
+uniform highp vec3 color_mdl;
+
+varying highp vec3 position_wrld;
+varying highp vec3 normal_cmr;
+varying highp vec3 eyeDirection_cmr;
+varying highp vec3 lightDirection_cmr;
+
+void main() {
+    highp vec3 lightColor = vec3(1.0, 1.0, 1.0);
+    highp float lightPower = 10.0;
+    highp vec3 materialAmbientColor = vec3(0.5, 0.5, 0.5) * color_mdl;
+    highp vec3 materialSpecularColor = vec3(0.3, 0.3, 0.3) * color_mdl;
+
+    highp float distance = length(lightPosition_wrld - position_wrld);
+
+    highp vec3 n = normalize(normal_cmr);
+    highp vec3 l = normalize(lightDirection_cmr);
+    highp float cosTheta = clamp(dot(n, l), 0.0, 1.0);
+
+    highp vec3 E = normalize(eyeDirection_cmr);
+    highp vec3 R = reflect(-l, n);
+    highp float cosAlpha = clamp(dot(E, R), 0.0, 1.0);
+
+    gl_FragColor.rgb =
+        materialAmbientColor +
+        materialSpecularColor * lightColor * lightPower * pow(cosAlpha, 5) / (distance * distance);
+    gl_FragColor.a = 1.0;
+}
+